In this paper, higher-order finite-difference time-domain (FDTD) method with second-order of accuracy in time and eighth-order of accuracy in space for solving general multiconductor transmission-line (MTL) equations is presented. This algorithm is applied to calculating lightning-induced voltages on lossy power lines. Computed results using various numerical schemes are illustrated and compared o...
View full abstract»

This paper investigates the problem of fault location based on transient signals obtained at single-end of the transmission line. Current travelling waves are utilized to locate faults on transmission system. In this paper a review of different travelling wave methods in fault location is presented. The wavelet transforms is used for analyzing power system fault transients to determine the fault l...
View full abstract»

This paper investigates the performance of a 4-switch, 3-phase inverter (4S3P) fed cost effective induction motor (IM) drive system for high performance industrial drive systems. In the proposed approach, instead of a conventional 6-switch, 3-phase inverter (6S3P) a 4-switch, 3-phase inverter is utilized. This reduces the cost of the inverter, the switching losses, and the complexity of the contro...
View full abstract»

This paper presents a reactive power valuation method with regarding to its effect on realization of MW transactions. The security constraint optimization model in which the objective function is maximization of transactions is solved by the genetic algorithm approach. The proposed scheme allocates a specific amount of MW transactions to each dynamic reactive power source. An index is introduced t...
View full abstract»

In general, directional overcurrent relays allow for continuous time dial settings but discrete pickup current settings. All previous work formulates the coordination problem either as a linear programming problem or as a nonlinear programming problem. In this paper, the protective relay coordination problem is reformulated to take into account the discrete pickup current values. The coordination ...
View full abstract»

Intelligent techniques, such as fuzzy logic methods, have been successfully applied to the dynamic control of renewable energy systems. This research develops component models, based on fuzzy logic principles, of a grid-connected renewable energy system consisting of wind turbines, photovoltaics, and battery storage. The models are evaluated for accuracy using several tests that compare the model ...
View full abstract»

Harmonics in electrical distribution systems are created from a number of sources, and produce a variety of undesirable side effects, therefore it is important to understand all solutions that are available. Phase shifting will be reviewed as one concept for solving certain types of problems related to power quality. Both theoretical concepts and a case study are presented.
View full abstract»

Design and application of an on-line diagnostic system for squirrel cage induction motors based on inductive acquisition and sideband analysis of phase current. Controlled faults were produced on a squirrel cage motor under laboratory conditions to confirm and assess sideband diagnostic sensibility prior to field-testing. Those induced faults included broken bar and eccentric gap to evaluate curre...
View full abstract»

Under new deregulation environment an open access to transmission system is desired transmission system operators (TSOs) are encouraged to use the existing facilities more efficiently. This paper focuses on the evaluation of the impact of FACTS devices on available transfer capability (ATC) and its enhancement. A genetic algorithm is used for optimisation process of the best location of SVC as a F...
View full abstract»

This paper presents a new and simple technique to solve the optimal solution of a short-term economic dispatch problem of all thermal power system, when the load on the system is fuzzy. The hard constrained, using this technique are transferred to soft constraints. A triangular membership for the load is assumed. A simulated example for a system of two units is presented in this paper to explain t...
View full abstract»

The aim of this paper is to review recent developments in anti-islanding techniques for distributed resources interconnected with electric power systems. The techniques may be classified as remote and local. Remote techniques are associated with island detection on the utility side while local techniques are associated with island detection on the distributed power generation side. Local technique...
View full abstract»

This paper proposes a scheme for on-line voltage stability monitoring using artificial neural network (ANN) and a systematic way for training the ANN. Separate ANNs are used for different contingencies and for different load levels under the same contingency. Results of contingency analysis are used along with principal component analysis (PCA) to choose important input features to train the ANN. ...
View full abstract»

This paper presents the assessment of the voltage dip phenomenon of a practical system in Saudi Arabia. There is a substantial body of literature available about voltage dips, but there is no clear and formal international standard on the phenomenon. There exists no international standard as to the acceptable voltage dip magnitude, and duration. The study utilized some of the widely used internati...
View full abstract»

This paper presents a numerical power method to discriminate the magnetizing inrush current from the fault currents in single-phase transformers. The proposed technique is based on the average power flowing into transformers during the fault current or the transformer inrush current. The internal fault consumes power larger than what the inrush current consumes. Hubert transform is used to calcula...
View full abstract»

Transient stability simulation is an important aspect of dynamic security assessment (DSA) in power systems. In the deregulated environment, simulation results are more sensitive to models and parameters. In this paper, based on many simulation cases, the effects of neglecting speed instantaneous changes in generator modeling on transient stability are discussed. Based on extended equal area crite...
View full abstract»

The conventional method for determining the parameters of the transformer is to performing the open and short-circuited tests. The method is only suitable for off-line application. This paper presents an alternative approach to conventional open and short-circuit test for determining the parameters of N-windings transformer operating at power frequency on an on-line mode. This approach is based on...
View full abstract»

In this paper is reported the software development for power systems analysis using several techniques combining the object oriented programming paradigm, computer graphics techniques, distributed data base and software engineering. Three software packages have been implemented: CAPS, SIGVNS and TREINOM. CAPS package is oriented for interactive analysis of power systems and electric markets. SIGVN...
View full abstract»

This paper presents a new technique for detecting and characterizing disturbances in power systems based on wavelet transforms. The voltage signal under investigation is often corrupted by noises, therefore the signal is first de-noised and then wavelet transform is applied. Using the first detail wavelet coefficients, voltage disturbance is detected and its duration is determined. The voltage dis...
View full abstract»

One of the best-innovated flexible AC transmission system (FACTS) devices is the static synchronous series compensator (SSSC). This device is effective to alter power system parameters in order to increase power transfer capability, stabilize system, help energy market resolve congestion-caused problems, and maximize economic value of transmission system. Therefore, the paper investigates modeling...
View full abstract»

One important assumption in a model of an electricity market is the format of bids and costs. Most literature on electricity markets uses piecewise linear or quadratic functions to represent cost and bid. Economic theory holds that a firm in a perfectly competitive market maximizes its profit when it sells at marginal cost. This implies that profit-maximizing generators bid at marginal cost. Diffe...
View full abstract»

The main purpose of this paper is to identify the optimal location of the unified power flow controller UPFC in electrical power systems. The proposed algorithm is based on the steady state injection model of UPFC, a continuation power flow and an optimal power flow. The problem is formulated to find the best location of UPFC in order to minimize the generation cost function and the investment on ...
View full abstract»

In this paper, the structure of a distributed power generation system based on renewable energy is presented. The energy complementary control principle is introduced for this system. A mathematical model of the system is built according to the energy complementary control principle. A vector control method is designed for the flywheel energy storage unit to improve the system performance. The sim...
View full abstract»

This paper presents harmonic detecting method for a shunt hybrid active filter using adaptive filter. An adaptive noise canceling theory has been applied as a harmonic detection system to determine a harmonic reference signal for controlling an active filter inverter. This paper presents a new configuration of adaptive method to detect the harmonic components from the distorted source current cons...
View full abstract»

This paper reports experimental work conducted in 3×150 mm 2 pT 240 VAC directly buried cables energized at 120 V under laboratory conditions with the goal of assessing an adequate spacing between automatic electric networks and gas lines. Evaluated cables were intentionally faulted using a metallic element and then they were located in the vicinity of a simulated gas line inside a wooden bo...
View full abstract»